What is an addon domain?

Addon Domains are a cPanel feature which allow you to add additional domains to your hosting. This will allow you to host multiple websites from within the same cPanel hosting account.

Adding an Addon Domain to your cPanel hosting account adds a folder which becomes the root public folder for your new domain, and any files within that folder will be public for the domain you choose to add, just like the public_html folder for your primary domain name.